Adds a deliberate extra sign-in layer covering the entire nginx gateway
(portal page + every proxied web UI) via a shared htpasswd credential
generated on the FreeIPA container and published to nginx through a new
portal-auth volume. FreeIPA, CheckMK and Keycloak still each enforce their
own login behind it — two prompts beats one attacker who only had to beat
one lock. Healthcheck updated to treat 401 as healthy accordingly.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Amir Alexander Abdelbaki